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+--- Thread: G4 iMac iLamp video problem-- the aftermath. (/showthread.php?tid=8810)
G4 iMac iLamp video problem-- the aftermath. - RAMd®d - 04-06-2006
My buddy's G4 iMac ( http://forums.macresource.com/read/1/76158/76158#msg-76158 ) went T/U and though it booted and "ran", there was no display.
He could not see the desktop in the display (I told you he checked) so took it to a trusted Mac hospital.
Diagnosis-- bad logic board.
Prognosis-- new board, and while he's in there, upgrade the "hidden" RAM, maybe add a 120/300G HD, depending on the limit of the controller.
He should have it back after two days.
Re: G4 iMac iLamp video problem-- the aftermath. - Refurbvirgin - 04-06-2006
Ouch. What did that cost?
Re: G4 iMac iLamp video problem-- the aftermath. - WHiiP - 04-06-2006
Sorry to hear about the needed surgery . . . I would like to hear more about the logic board failure if they can tell him what might have caused it, or what part actually failed.
Obviously a good time to be adding the other improvements . . .
Thanks for the f/u . . .
Re: G4 iMac iLamp video problem-- the aftermath. - incognegro - 04-06-2006
i've replaced a few of these logic boards for the same symptom you described.
seems it's the video chip on the MLB that goes bad.
Re: G4 iMac iLamp video problem-- the aftermath. - particleman - 04-06-2006
I have a G4 iMac 17" 1 GHz with video problems as well. The backlight comes on but no video. I can hook up a monitor to the external and use the computer. Could this be a problem with the logic board video chip? Or, could something have worked loose? The external video connector is soldered to the logic board while the lcd display uses a socket.
Re: G4 iMac iLamp video problem-- the aftermath. - incognegro - 04-06-2006
could be the MLB, yes, particleman...
"when he's under water does he get wet, or does the water get him instead?"
Re: G4 iMac iLamp video problem-- the aftermath. - particleman - 04-07-2006
incognegro Wrote:
-------------------------------------------------------
> could be the MLB, yes, particleman...
>
> "when he's under water does he get wet, or does
> the water get him instead?"
Thanks for the reply. It could indeed be a video fault on the MLB. It just seems odd that the external video puts out a useful signal while nothing goes to the flat panel. Are there two video circuits? I don't know. I don't even play an electrical engineer on TV.
Hopefully, when I get around to cracking it open and blowing the dust out, I will just find that the video connector has worked loose. Unfortunately, it is barely worth having it fixed.